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Vincent Roule,Ziad Dahdouh,Adrien Lemaitre,Rémi Sabatier,Thérèse Lognoné,Mathieu Bignon,Guillaume Malcor,Gilles Grollier 대한심장학회 2012 Korean Circulation Journal Vol.42 No.4
We report the case of a man who presented with acute anterior myocardial infarction and in whom the coronary angiogram showed tight stenosis of the left anterior descending coronary artery and the right coronary artery associated with substantial coronary-pulmonary fistulas involving all three major coronary arteries. We discuss the possible links between coronary artery fistulas and myocardial infarction.
Jang, In-Hwan,Chosa, Naoyuki,Kim, Sung-Hee,Nam, Hyuck-Jin,Lemaitre, Bruno,Ochiai, Masanori,Kambris, Zakaria,Brun, Sylvain,Hashimoto, Carl,Ashida, Masaaki,Brey, Paul T.,Lee, Won-Jae Elsevier 2006 Developmental cell Vol.10 No.1
<P><B>Summary</B></P><P>The Toll receptor was originally identified as an indispensable molecule for <I>Drosophila</I> embryonic development and subsequently as an essential component of innate immunity from insects to humans. Although in <I>Drosophila</I> the Easter protease processes the pro-Spätzle protein to generate the Toll ligand during development, the identification of the protease responsible for pro-Spätzle processing during the immune response has remained elusive for a decade. Here, we report a protease, called Spätzle-processing enzyme (SPE), required for Toll-dependent antimicrobial response. Flies with reduced SPE expression show no noticeable pro-Spätzle processing and become highly susceptible to microbial infection. Furthermore, activated SPE can rescue ventral and lateral development in embryos lacking Easter, showing the functional homology between SPE and Easter. These results imply that a single ligand/receptor-mediated signaling event can be utilized for different biological processes, such as immunity and development, by recruiting similar ligand-processing proteases with distinct activation modes.</P>
Synergy of glucose and growth hormone signalling in islet cells through ICA512 and STAT5
Mziaut, Hassan,Trajkovski, Mirko,Kersting, Stephan,Ehninger, Armin,Altkrü,ger, Anke,Lemaitre, Ré,gis P.,Schmidt, Darja,Saeger, Hans-Detlev,Lee, Myung-Shik,Drechsel, David N.,Mü,ller, Ste Nature Publishing Group 2006 Nature cell biology Vol.8 No.5
Nutrients and growth hormones promote insulin production and the proliferation of pancreatic β-cells. An imbalance between ever-increasing metabolic demands and insulin output causes diabetes. Recent evidence indicates that β-cells enhance insulin gene expression depending on their secretory activity. This signalling pathway involves a catalytically inactive receptor tyrosine phosphatase, ICA512, whose cytoplasmic tail is cleaved on glucose-stimulated exocytosis of insulin secretory granules and then moves into the nucleus, where it upregulates insulin transcription. Here, we show that the cleaved cytosolic fragment of ICA512 enhances the transcription of secretory granule genes (including its own gene) by binding to tyrosine phosphorylated signal transducers and activators of transcription (STAT) 5 and preventing its dephosphorylation. Sumoylation of ICA512 by the E3 SUMO ligase PIASy, in turn, may reverse this process by decreasing the binding of ICA512 to STAT5. These findings illustrate how the exocytosis of secretory granules, through a retrograde pathway that sustains STAT activity, converges with growth hormone signalling to induce adaptive changes in β-cells in response to metabolic demands.
Buchon, Nicolas,Poidevin, Mickael,Kwon, Hyun-Mi,Guillou, Auré,lien,Sottas, Valentin,Lee, Bok-Luel,Lemaitre, Bruno National Academy of Sciences 2009 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.106 No.30
<P>The Drosophila Toll receptor does not interact directly with microbial determinants, but is instead activated by a cleaved form of the cytokine-like molecule Spätzle. During the immune response, Spätzle is processed by complex cascades of serine proteases, which are activated by secreted pattern-recognition receptors. Here, we demonstrate the essential role of ModSP, a modular serine protease, in the activation of the Toll pathway by gram-positive bacteria and fungi. Our analysis shows that ModSP integrates signals originating from the circulating recognition molecules GNBP3 and PGRP-SA and connects them to the Grass-SPE-Spätzle extracellular pathway upstream of the Toll receptor. It also reveals the conserved role of modular serine proteases in the activation of insect immune reactions.</P>
Ziad Dahdouh,Vincent Roule,Thérèse Lognoné,Rémi Sabatier,Mathieu Bignon,Guillaume Malcor,Adrien Lemaitre,Katrien Blanchart,Julien Wain-Hobson,Vladimir Saplacan,Fabio Cutone,Dimitrios Buklas,Calin Ivas 대한심장학회 2012 Korean Circulation Journal Vol.42 No.7
Although rare, iatrogenic aortocoronary dissection is one of the complications most dreaded by the interventional cardiologist. If not managed promptly, it can have redoubted and serious consequences. Herein, we present the case of a 70 year-old woman who was treat-ed by stenting of the second segment of the right coronary artery (RCA) for recurrent angina but, unfortunately, the procedure was com-plicated by anterograde dissection of the RCA with a simultaneous retrograde propagation to the proximal part of the ascending aorta. Successful stenting of the entry point was able to recuperate the RCA and to limit the retrograde propagation to the ascending aorta, but there was an extension of the dissection to the aortic valve leaflets resulting in a massive aortic insufficiency. Therefore, an isolated surgi-cal aortic valve replacement was performed. Although rare, iatrogenic aortocoronary dissection is one of the complications most dreaded by the interventional cardiologist. If not managed promptly, it can have redoubted and serious consequences. Herein, we present the case of a 70 year-old woman who was treat-ed by stenting of the second segment of the right coronary artery (RCA) for recurrent angina but, unfortunately, the procedure was com-plicated by anterograde dissection of the RCA with a simultaneous retrograde propagation to the proximal part of the ascending aorta. Successful stenting of the entry point was able to recuperate the RCA and to limit the retrograde propagation to the ascending aorta, but there was an extension of the dissection to the aortic valve leaflets resulting in a massive aortic insufficiency. Therefore, an isolated surgi-cal aortic valve replacement was performed.